温暖化ガスの地中貯留、米テキサス州の地震と関連 研究成果


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[November 7 AFP] the warming measure technology which presses greenhouse gas fit into a stratum and it stores in the earth, The report of research it is indicated that may have been the cause of the earthquake which succeeded one another in the Texas, U.S., (Texas) state was released by the U.S. science academy bulletin (Proceedings of the National Academy of Sciences, PNAS) on the 4th.
Although the paper which points out to ?PNAS a possibility that subterranean storage of greenhouse gases will induce an earthquake last year also was published, as for the beam paper with direct relation, this time is the first in subterranean storage and the earthquake of magnitude (M)3.0?4.4.
Research of ? this time focused on the seismic activity of the コグデル oil field (Cogdell Oil Field) in the Scully (Scurry) county and the Kent (Kent) county in northwestern Texas, and the Kelley Snyder oil field (Kelly-Snyder Oil Field).
In ? コグデル oil field, it applied in 1957?82, and in order to increase quantity of output, the technology of a water flood was used.
It was already shown clearly by the past research in this area owing to this that the earthquake occurred in 75?82.
■ Press fit and an earthquake succeed methane and CO2 one another in the earth.
According to research of Mr. Wei Gang (Wei Gan) of the University of Texas Austin school (University of Texas at Austin) geophysics center and Mr. Cliff Frolich (Cliff Frohlich), this time [ ? ] In order to investigate the influence of recovery and the storage of carbon dioxide (CCS), by the latest research done for the fund of the U.S. Department of Energy, a lot of methane and carbon dioxide (CO2) were pressed fit in the underground of this oil field.
CCS is the technology proposed as a reduction measure of greenhouse gas, and collects CO2 — underground — it is the method of boiling deeply, pressing fit and storing for a long period of time.
? paper pointed out a possibility that the earthquake beyond magnitude 3 was successively caused by CCS, on a コグデル oil field and the outskirts of it as most serious result of this investigation in 06 and afterwards.
On a コグデル oil field and the outskirts of it, M4.4 was recorded for the earthquake beyond M3 18 times by 06?? 12 on あり and September 11, 2011.
In March, 09 ? December, 10, the earthquake occurred no less than 93 times especially, and 3 times was more than M3.
Since, as for ? paper, the earthquake was not observed for 24 years after the start of a water flood, these earthquakes suppose that it cannot explain in press fit of water.
Moreover, it is being surmised whether pressure has a weak fault only around a コグデル oil field noting that the point that the earthquake has not occurred in the same near oil fields, such as the Kelley Snyder oil field, is a mystery.
Research of ? this time was done by the United States Geological Survey (US Geological Survey, USGS) and the China state natural science fund committee (National Natural Science Foundation of China, NSFC) paying funds.
(c)AFP
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